FT8870A-RT LED Driver IC Equivalent & Substitute Parts

Part Overview

The FT8870A-RT is an AC DC offline switcher LED driver IC manufactured by Fremont Micro Devices Ltd, designed for backlight applications with a single output delivering 180mA at 5kHz frequency. The device features an internal switch, step-down (buck) topology, and operates across a supply voltage range of 5.3V to 8V with an operating temperature range of -40°C to 125°C (TA). The FT8870A-RT is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

FT8870A-RT

Fremont Micro Devices LtdIn Stock: 990FT8870A-RT Datasheet

Current PartRFQ

FT886A-RT

Fremont Micro Devices LtdIn Stock: 3670FT886A-RT Datasheet

Parametric EquivalentRFQ

AL8822SP-13

Diodes IncorporatedIn Stock: 30421AL8822SP-13 Datasheet

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LNK406LG

Power IntegrationsIn Stock: 1245LNK406LG Datasheet

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MP4088GS-Z

Monolithic Power Systems Inc.In Stock: 4748MP4088GS-Z Datasheet

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RT8497AGS

Richtek USA Inc.In Stock: 25338RT8497AGS Datasheet

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UCC28811D

Texas InstrumentsIn Stock: 3480UCC28811D Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the FT8870A-RT is determined by the following critical parameters: AC DC offline switcher topology, single output configuration, internal switch presence, 8-SOIC surface mount package, and operating temperature range of -40°C to 125°C. The substitute parts are grouped based on their ability to maintain functional equivalence within these constraints.

Parametric Equivalent: FT886A-RT maintains the same manufacturer lineage, topology, package, and operating temperature range, with differences in supply voltage range (9V to 20V versus 5.3V to 8V).

Similar Alternatives: AL8822SP-13, LNK406LG, MP4088GS-Z, and UCC28811D provide AC DC offline switcher functionality with variations in topology (boost, flyback, buck-boost), supply voltage ranges, current ratings, and mounting types. These alternatives accommodate different circuit requirements while maintaining core LED driver functionality.

Obsolete Status Consideration: RT8497AGS is also classified as obsolete, limiting its suitability for new designs despite parametric similarities.

Parameter Comparison

Engineering Selection Recommendations

FT886A-RT is the primary parametric equivalent, offering identical topology, frequency, current rating, and package configuration with active product status and ROHS3 compliance. The supply voltage range difference (9V to 20V) requires circuit verification but maintains functional compatibility for applications within this range.

AL8822SP-13 provides active status and ROHS3 compliance with higher current capacity (2A) and wider supply voltage range (5V to 36V), suitable for applications requiring boost topology and increased output current. The 1MHz frequency and exposed pad package represent design trade-offs.

LNK406LG from Power Integrations offers the widest supply voltage range (36V to 725V) with active status and RoHS compliance, supporting triac dimming and flyback topology. Through-hole mounting and eSIP-7F package require PCB redesign. Operating temperature extends to 150°C (TJ) with MSL 1 rating.

MP4088GS-Z provides buck-boost topology with active status and ROHS3 compliance, supporting triac dimming. The 4.5V to 5V supply voltage range is narrower than the original part, limiting applicability to specific voltage domains.

UCC28811D from Texas Instruments offers active status and ROHS3 compliance with flexible topology support (flyback, buck, boost) and triac dimming capability. The absence of an internal switch and unspecified frequency and current parameters require detailed application analysis.

Frequently Asked Questions (FAQ)

Q: Can FT886A-RT directly replace FT8870A-RT in existing designs?

A: FT886A-RT maintains identical topology, frequency, current rating, package, and operating temperature range. The supply voltage range differs (9V to 20V versus 5.3V to 8V). Direct replacement is possible only if the circuit supply voltage falls within the 9V to 20V range. Circuit verification is required.

Q: What is the primary reason for seeking substitutes for FT8870A-RT?

A: The FT8870A-RT is classified as obsolete. Active alternatives ensure long-term availability, ongoing manufacturing support, and compliance with current regulatory standards.

Q: How do topology differences affect substitution?

A: The FT8870A-RT uses step-down (buck) topology. AL8822SP-13 uses boost topology, LNK406LG uses flyback, and MP4088GS-Z uses buck-boost. Topology changes alter circuit behavior, efficiency characteristics, and output voltage relationships. Application-specific analysis is required.

Q: Are all substitute parts surface mount compatible?

A: FT886A-RT, AL8822SP-13, MP4088GS-Z, and UCC28811D are surface mount. LNK406LG is through-hole mounted in eSIP-7F package, requiring PCB redesign.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: FT8870A-RT, FT886A-RT, and AL8822SP-13 have MSL 3 (168 hours). LNK406LG and UCC28811D have MSL 1 (unlimited). MP4088GS-Z has MSL 2 (1 year). Lower MSL values indicate greater tolerance to moisture exposure during storage and handling.

Q: Do all substitutes support the same dimming functionality?

A: FT8870A-RT does not specify dimming capability. AL8822SP-13, LNK406LG, MP4088GS-Z, and UCC28811D support triac dimming. Application requirements determine whether dimming support is necessary.

Q: What compliance certifications are relevant for selection?

A: FT886A-RT, AL8822SP-13, MP4088GS-Z, and UCC28811D are ROHS3 compliant. LNK406LG is RoHS compliant. All listed parts have REACH Unaffected or REACH Unaffected status where specified. ECCN classification is EAR99 for all parts.